Crank pulley bolt: reverse thread?

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Jul 11, 2005 | 06:29 AM

#21

mberndt

Senior Member

Joined: Jun 2005

Posts: 672

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From: Allentown PA, - Phila, PA

Quote:

Originally Posted by lingerbw

yessssaaaahhh.... I got the bolt off last night.

The hardware required:
(2) 10" 1/2" drive extensions (these came out past the wheel, so I was pulling outside the body of the car.

(1) 19mm 6pt deep socket (1/2" drive)
(1) 12" 1/2" drive braker bar

and the big dog:

(1) 5 foot length steel pipe

At first I was nervous with the ability to apply this much torque to a bolt. So, I started pulling, slowly at first. By the time I busted that bolt loose, I was really rocking back on the end of that cheater pipe. I can't imagine the amount of pressure that was being applied at the bolt. Anyway.... I'm very happy. On with the head gasket and timing belt job!! :thumbup:

My wife took some pics of the setup I had... I'll scan and post when I get them developed.

The amount of so called "pressure", which is actually called Torque, is a measurement of twisting force, which is applied to the bolt as a function of the force and the moment arm... (50lb)*(5ft) = 250 ft-lb of torque...
So, the longer the arm, the less force required...
But if you use a small ratchet, like a 3/4" drive, the force is spread out across less area, which increases the torsional and shear stresses, to the breaking point, in your case...
Also, you say you were really rocking back and forth on the pipe, there you can see and feel the deflection of the materials, steel in this case which is very ductile for the most part.
Later,
Mike

Jul 15, 2005 | 09:21 PM

#22

flatliner

Fix It

Joined: Jun 2005

Posts: 300

Likes: 0

From: midwest

once on a 92 teg i did a timing belt (10 years ago in 2ft of standing water) I had to use a 4 foot pole over my 1/2 in breaker bar and when it cracked loose, the pole was bent.

Welcome to HONDA

Jul 18, 2005 | 02:05 PM

#23

qtiger

Moderator

Joined: Jun 2001

Posts: 11,776

Likes: 0

I've never had a problem taking the bolts off. Moroso tool and a NAPA breaker, easy easy.

Jul 25, 2005 | 08:51 PM

#24

blanchae

Registered User

Joined: Jul 2005

Posts: 2

Likes: 0

Webpage shows how to do it

I had a similar problem with a Honda Civic, so here's a webpage that details how to loosen the crank pulley bolt:
http://www.cadvision.com/blanchas/54pontiac/honda.html

Jul 26, 2005 | 08:52 AM

#25

westcoaststyle

Still here... sorta...

Joined: Sep 2000

Posts: 17,177

Likes: 2

From: CO

Quote:

Originally Posted by blanchae

I had a similar problem with a Honda Civic, so here's a webpage that details how to loosen the crank pulley bolt:
http://www.cadvision.com/blanchas/54pontiac/honda.html

That's great and all, but it puts uneven pressure on the pulley and will likely bend it depending on the amount of force. I would recommend getting the correct tools for the job.

Jul 26, 2005 | 10:07 AM

#26

mberndt

Senior Member

Joined: Jun 2005

Posts: 672

Likes: 0

From: Allentown PA, - Phila, PA

Man, that is another stupid idea, LOL.

Get the right tools, I.E. a chain wrench, and it couldn't be simpler.

Sep 24, 2019 | 01:25 PM

#27

Nicky Hurshman

Junior Member

Joined: Sep 2019

Posts: 1

Likes: 0

From: ssm

Quote:

Originally Posted by mberndt

I'm going to get laughed at for reviving such an old thread but I couldn't resist (made an account for it and everything)

you're right... to an extent. torque is measured at the fulcrum point, but when you add extension bars (socket side) you're also reducing the torque you're applying, a lot of the energy being applied gets stored in the extensions and therefore you're not getting the torque you're quoting.
proper torquing is achieved with a torque wrench and no extensions... once you start adding cheater bars or extensions you might as well just use a normal ratchet/breaker-bar.